A twist and flick of the balls while receiving a blowjob, thus making the person grumpy.
Garrett was getting a BJ when Amy decided to bust out the grumpkin.
by sqwirll April 14, 2009
recieving head while in the process of shitting.
"That bitch was so nasty she gave me grumpkins!"
by mattneesy May 19, 2004
a mixture of a grundle grab and a knuckle butt fuck. it can be quite stimulating if used correctly
the wrestler used the grumpkin technique to score a reversal.
i blew my wad as soon as that filthy slut gave me a grumpkin.
by the cool breeze September 07, 2006
A woman no taller than five feet three inches tall and more than a few pounds overweight who would be cute if she lost a little weight. Often seen truck-truck-truckin' around.
Oh, there goes that lil' grumpkin truckin' around campus again.
by Marc November 17, 2003
a short, trollish, bitch that everyone hates. She's annoying, ugly, and the kinda girl you would love to punch in the face...repeatedly.
Brandon's girlfriend is such a grumpkin.
by clayton September 20, 2004
Describes sosmeone who suddenly turns extremely and uncharacteristically grumpy at night, particularly after midnight. Word evolved from pumpkin - someone who suddenely turns sleepy at midnight.
Watch out - after midnight she turns into a grumpkin!
by Grumpkin April 16, 2006
the act of taking a crap
Dude i just took a Grumpkin.
or Dude i need to take a Grumpkin.
by CGH16 August 26, 2007

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